/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.render.afp.extensions;
import java.net.URI;
import java.net.URISyntaxException;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
import org.xml.sax.helpers.DefaultHandler;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fop.render.afp.extensions.AFPPageSegmentElement.AFPPageSegmentSetup;
import org.apache.fop.util.ContentHandlerFactory;
import org.apache.fop.util.ContentHandlerFactory.ObjectBuiltListener;
/**
* ContentHandler (parser) for restoring AFPExtension objects from XML.
*/
public class AFPExtensionHandler extends DefaultHandler
implements ContentHandlerFactory.ObjectSource {
/** Logger instance */
protected static final Log log = LogFactory.getLog(AFPExtensionHandler.class);
private StringBuffer content = new StringBuffer();
private Attributes lastAttributes;
private AFPExtensionAttachment returnedObject;
private ObjectBuiltListener listener;
/** {@inheritDoc} */
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes)
throws SAXException {
boolean handled = false;
if (AFPExtensionAttachment.CATEGORY.equals(uri)) {
lastAttributes = new AttributesImpl(attributes);
handled = true;
if (localName.equals(AFPElementMapping.NO_OPERATION)
|| localName.equals(AFPElementMapping.TAG_LOGICAL_ELEMENT)
|| localName.equals(AFPElementMapping.INCLUDE_PAGE_OVERLAY)
|| localName.equals(AFPElementMapping.INCLUDE_PAGE_SEGMENT)
|| localName.equals(AFPElementMapping.INCLUDE_FORM_MAP)
|| localName.equals(AFPElementMapping.INVOKE_MEDIUM_MAP)) {
//handled in endElement
} else {
handled = false;
}
}
if (!handled) {
if (AFPExtensionAttachment.CATEGORY.equals(uri)) {
throw new SAXException("Unhandled element " + localName
+ " in namespace: " + uri);
} else {
log.warn("Unhandled element " + localName
+ " in namespace: " + uri);
}
}
}
/** {@inheritDoc} */
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
if (AFPExtensionAttachment.CATEGORY.equals(uri)) {
if (AFPElementMapping.INCLUDE_FORM_MAP.equals(localName)) {
AFPIncludeFormMap formMap = new AFPIncludeFormMap();
String name = lastAttributes.getValue("name");
formMap.setName(name);
String src = lastAttributes.getValue("src");
try {
formMap.setSrc(new URI(src));
} catch (URISyntaxException e) {
throw new SAXException("Invalid URI: " + src, e);
}
this.returnedObject = formMap;
} else if (AFPElementMapping.INCLUDE_PAGE_OVERLAY.equals(localName)) {
this.returnedObject = new AFPPageOverlay();
String name = lastAttributes.getValue("name");
if (name != null) {
returnedObject.setName(name);
}
} else if (AFPElementMapping.INCLUDE_PAGE_SEGMENT.equals(localName)) {
AFPPageSegmentSetup pageSetupExtn = null;
pageSetupExtn = new AFPPageSegmentSetup(localName);
this.returnedObject = pageSetupExtn;
String name = lastAttributes.getValue("name");
if (name != null) {
returnedObject.setName(name);
}
String value = lastAttributes.getValue("value");
if (value != null && pageSetupExtn != null) {
pageSetupExtn.setValue(value);
}
String resourceSrc = lastAttributes.getValue("resource-file");
if (resourceSrc != null && pageSetupExtn != null) {
pageSetupExtn.setResourceSrc(resourceSrc);
}
if (content.length() > 0 && pageSetupExtn != null) {
pageSetupExtn.setContent(content.toString());
content.setLength(0); //Reset text buffer (see characters())
}
} else {
AFPPageSetup pageSetupExtn = null;
if (AFPElementMapping.INVOKE_MEDIUM_MAP.equals(localName)) {
this.returnedObject = new AFPInvokeMediumMap();
} else {
pageSetupExtn = new AFPPageSetup(localName);
this.returnedObject = pageSetupExtn;
}
String name = lastAttributes.getValue(AFPPageSetup.ATT_NAME);
if (name != null) {
returnedObject.setName(name);
}
String value = lastAttributes.getValue(AFPPageSetup.ATT_VALUE);
if (value != null && pageSetupExtn != null) {
pageSetupExtn.setValue(value);
}
String placement = lastAttributes.getValue(AFPPageSetup.ATT_PLACEMENT);
if (placement != null && placement.length() > 0) {
pageSetupExtn.setPlacement(ExtensionPlacement.fromXMLValue(placement));
}
String encoding = lastAttributes.getValue("encoding");
if (encoding != null && pageSetupExtn != null) {
pageSetupExtn.setEncoding(Integer.parseInt(encoding));
}
if (content.length() > 0 && pageSetupExtn != null) {
pageSetupExtn.setContent(content.toString());
content.setLength(0); //Reset text buffer (see characters())
}
}
}
}
/** {@inheritDoc} */
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
content.append(ch, start, length);
}
/**
* {@inheritDoc}
*/
@Override
public void endDocument() throws SAXException {
if (listener != null) {
listener.notifyObjectBuilt(getObject());
}
}
/**
* {@inheritDoc}
*/
public Object getObject() {
return returnedObject;
}
/**
* {@inheritDoc}
*/
public void setObjectBuiltListener(ObjectBuiltListener listen) {
this.listener = listen;
}
}